which syntax is correct about true false and null, Basic, CodeIgniter

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Question:Which syntax is correct about TRUE,FALSE and NULL?

A if($active == true)<br />$zero = null;<br />function test($test = false) 
B if($active == true)
$zero = NULL;
function test($test = FALSE) 
C if($active == TRUE)
$zero = NULL;
function test($test = FALSE) 
D if($active = TRUE)
$zero = NULL;
function test($test = FALSE)

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Question:Which syntax is correct about TRUE,FALSE and NULL?

A if($active == true)<br />$zero = null;<br />function test($test = false)

B if($active == true) $zero = NULL; function test($test = FALSE)

C if($active == TRUE) $zero = NULL; function test($test = FALSE)

D if($active = TRUE) $zero = NULL; function test($test = FALSE)

C